Fuel feeding device for internal combustion engines



May 9, 1939- F. EGERSDRFER .2,157,284

FUEL FEEDING DEVICE FORLINTERNAL C'MBUSTION ENGINES Original Filed Sept.4, 1937 2 Sheets-Sheet l May 9, 1939.

original Filed sept'. 4, 1937 IPM TAN

@ www I I' Attorney F. EGERSDRFER l 2,157,m24

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[UNITED STATES PATENT ori-pics V FUEL FEEDING DEVICE FOR INTERNALCOIIIBUSTIN ENGINES Fritz Egersdrfer, Berlin, Germany Originalapplication September it, 1937, Serial No.l 162,430. Divided and thisapplication May 18, 1936, Serial No. 203,617. In Germany september 26,31932 having suction and pressure conduits located respectively atopposite sides of the lines of engagement ofthe said 'gear wheels, thepressure conduits of the said pump being connected with distlibuting`members rotated by one of the driving shafts of the said gear wheels,and having ports forl supplying the fuel to the cylinders of the engine.

One of the objects of the improvements is to provide simple andefficient means for regulating the amount of fuel supplied to theengine, and with this object in view my invention consists inconstructing the pump with three gear wheels interengaging in pairs, amedian gear wheel be-4 ing in mesh with the outer gear wheels, and beingadapted to be shifted in axial direction yfor varying the active lengthof the fuel feeding teeth. Thus by shifting only one of the said gearwheels thesupply of fuel to two pressure conduits and to a1corresponding' number of cylinders is regulated. l

Another object of the improvements is to provide a pump of the vclassindicated in which the distributing member is simple in construction andconstructed so as to supply fuel to a large number of cylinders, andwith this object in view my invention consists in constructing thedistributing member for each sectional pump in the form of a cylindricalblock carried by the shaft of the outer gear wheel and disposing bothcylindrical distributing members within sockets made "in a blockinterposed between the cylindrical casing of the pump and oneof theheads thereof.

For the purpose of explaining the invention an example embodying thesame has been shown in the accompanying drawings in which the samereference characters have been used in all the views to indicatecorresponding parts. In said drawings,

Fig. 1 is a sectional elevation showing the fuel distributing pump,

Fig. 2 is a. sectional plan view taken on the line 2 2 of Fig. 1,A and yFigs. 3 to 5 are sectional elevations taken respectively on the lines 33, 4 4', and 5 5 of llig. 1. e

In the example shown in the figures the pump comprises a cylinder I,cylinder heads 2 and 3, a'block 4 interposed between the cylinder i andthe head 3, gear wheels 5, 6, and l, bushings 3. 9, I0, II, I2, andv I3,a driving shaft I4 having the 5 gear wheel Ii keyed thereto anon-rotatable shaft I5 which is axially shiftable, and which has thegear wheel l rotatable thereon, and a driven shaft I6 which has the gearwheel 5 keyed thereto. The shaft 15 is axes to the bushings lz @ma 10"I3, and the gear wheel l Ais rotatable'on a bushing I1 providing aspacing member for the bushings I2 and i3. As showri the shaft I5 isformed with a screw-threaded inner end 3B, and it is formed with acollar 3l, the bushing I 2 acting as a nut lliv clamping the partstogether. f The Ygear wheels 5 and l provide a pump having suction andpressure conduits I8 and I9, and the gear 'wheels 'I and 5 provideanother pump having suction and pressure conduits 20 and 2|.y Thevolumeof fuel 20 supplied by each pump may be regulated by shifting thebushings l2 and I3 andthe gear wheel'v 1 in axial direction.

In .bushings 25 fitted in sockets of the block 4 distributing members 26are rotatable which 25r are keyed respectivelyv to the shafts I 6 andI4, and the said members are formed with longitudinal bores 24 openingin annular recesses 21 made respectively in the block 4 and the head 3,and the said recesses are connected by passages 28. and 30 29 with thepressure conduits I9 andZ I, the passages 29 including spring pressedvalves 30. `The distributing members 26 are formed each with a radialbore 3i opening into a slot32, and the said slots cooperate with ports33 connected with pas- 35 sages 34 adapted to be connectedthrough pipeswith the cylinders of the engine. In the construction shown in thefigures, and more particularly in Fig. 5, six ports 33 and` passages 34are provided for each pump,vso that vthe fuel feeding 40 l device may beused for supplying fuel to'an engine having twelve cylinders. Byproviding a plurality of bores 24 in the members 26 and annular recesses2l at both sides of the said member the pressure exerted by the fuel ofboth sides 45 of the members 26 is compensated, so that the friction ofthe members is small.

`In. the operation of the pump the fuel is drawn in through the suctionconduits I8 and 20 and supplied to the pressure conduits I9 and 2I. 50From the said pressure conduits the fuel is supplied through thepassages 29 tothe bores 24' and 3l of the blocks 26, and from the bores3i it is successively supplied to the passages 33,34 and the cylindersof the engine. 'I'he amount of fuel 55 is regulatedby shifting the shaftIl and the gear wheel so as to reduce the active length of the teeth ofthe gear wheels 1 and i, C. Thereby the supply of fuel by means of bothpumps is regulated in the same way.

site sides of the lines of engagement of the pairs of meshing gearwheels. with suction and pressure chambers, driving means for said gearwheels, means for axially shifting .said median gear wheel for varyingthe active length of the 5 teeth of the meshing gear wheels, and fueldistributing members in driving connection with the outer gear wheelsand respectively connected with said pressure chambers, said casingbeing formed with delivery passages located in position for m receivingfuel from said distributing members. FRITZ EGERSDORFER.

